Pro Rata Calculator
Work out a pro rata salary from a full-time figure. Enter the full-time salary and your hours or days versus full-time, and the calculator shows your pro-rata pay annually, monthly, weekly, hourly and daily, plus your pro-rata holiday — with term-time and part-year support and the working shown.
£18,000 pro rata (60% of full-time)
£1,500.00/month · £346.15/week · £15.38/hour · £115.38/day
Pro-rata holiday: 16.8 days (from 28 full-time)
£30,000 × 22.5 ÷ 37.5 = £18,000
Shows gross pro-rata pay (before tax and National Insurance). For take-home pay, deductions apply on top. Term-time? Lower the weeks-per-year. How we calculate →
How to calculate a pro rata salary
Pro rata is Latin for “in proportion”. A pro rata salary scales a full-time (FTE) salary down to the hours or days you actually work: FTE salary × (your hours or days ÷ full-time hours or days). For example, £30,000 × (22.5 ÷ 37.5) = £18,000 for someone on 22.5 of a 37.5-hour week — 60% of full-time. Enter your numbers above and the calculator shows the pro rata salary plus the monthly, weekly, hourly and daily figures instantly.
Work it out by hours or by days
You can pro-rate by hours per week or days per week — switch the toggle to whichever your contract uses. Days-based is common for roles described as “3 days a week”; hours-based is more precise when shifts vary. Either way the proportion is the same idea: the share of a full-time week you work. A standard UK full-time week is often 37.5 hours (or 5 days), but set your employer's actual figure if it differs.
Pro rata holiday entitlement
Part-time workers get the same holiday in proportion to full-timers. If a full-time role gets 28 days, someone working 3 of 5 days a week gets 28 × 3 ÷ 5 = 16.8 days. The calculator works this out alongside your pay using your full-time holiday figure. Bank holidays may be included in that entitlement or given on top — it depends on the contract, and part-timers whose day off falls on a bank holiday shouldn't lose out overall.
Term-time, part-year and annualised hours
If you only work part of the year — term-time in a school, or a seasonal contract — your pay is pro-rated by the weeks you work ÷ 52 as well as your hours. Lower the “weeks worked per year” field and the calculator factors it in: for instance £28,000 × (39 ÷ 52) = £21,000 for 39 paid weeks. Annualised-hours contracts spread the same total hours evenly across 12 monthly payments.
Frequently asked questions
What does pro rata mean?
Pro rata is Latin for “in proportion”. In pay, it means a salary scaled to the hours or days you work compared with a full-time role — so 22.5 hours of a 37.5-hour week is 60% of the full-time salary.
How do you calculate a pro rata salary?
Multiply the full-time (FTE) salary by your hours or days divided by full-time hours or days: FTE × (your hours ÷ full-time hours). For example £30,000 × (22.5 ÷ 37.5) = £18,000. The calculator also breaks it down into monthly, weekly, hourly and daily figures.
Is a pro rata salary the same as part-time pay?
For salaried part-time staff, effectively yes — pro rata is the method used to work out part-time pay. It scales the full-time salary to your contracted hours or days. It doesn't apply to self-employed contractors, who set their own rates.
How is pro rata calculated for term-time or part-year workers?
Add a weeks fraction on top of the hours fraction: FTE × (your hours ÷ full-time hours) × (weeks worked ÷ 52). For 39 paid weeks of a £28,000 role that's £28,000 × 39 ÷ 52 = £21,000. Lower the weeks-per-year field to model this.
Does a pro rata salary include holiday pay?
Part-time workers get pro-rata statutory holiday — at least 5.6 weeks, so 3 days a week earns 3 × 5.6 = 16.8 days. The calculator shows pro-rata holiday days next to your pay; bank holidays may be within that or on top depending on your contract.
How do I work out a pro rata daily or hourly rate?
The hourly rate is the annual full-time salary ÷ 52 ÷ full-time weekly hours; the day rate is the hourly rate × hours in a working day (commonly 7.5). The calculator shows both so you can check overtime or extra shifts.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →